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Epics really only have an overarching workflow of To-do -> In-progress -> Done, but you can give them whatever Jira workflow you want as well.
The to-do, in-progress and done steps are more generalised meta-status, but they have some simple rules which I think you should consider matching:
An Epic is in To-do when it, and none of the stories it contains have been started (everything is in the backlog, possibly refined and updated, but no-one has started work on any of them)
It's done when it, and all of its stories are done - no-one is going to do any more work on any part of it.
It's in-progress when any part of it is being worked on - could be just one story, could be that all stories are done bar one - the Epic is in-progress because it's neither to-do, nor done.
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